Effect of KI and KOH Impregnations over Activated Carbon on H2S Adsorption Performance at Low and High Temperatures

Journal article

Authors/Editors

NAVADOL LAOSIRIPOJANA

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Publication Details

Author list: Sitthikhankaew R., Chadwick D., Assabumrungrat S., Laosiripojana N.

Publisher: Taylor and Francis Group

Publication year: 2014

Journal: Separation Science and Technology (0149-6395)

Volume number: 49

Issue number: 3

Start page: 354

End page: 366

Number of pages: 13

ISSN: 0149-6395

eISSN: 1520-5754

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84892556672&doi=10.1080%2f01496395.2013.841240&partnerID=40&md5=2d31b8093a047e44ce6b4212623cae61

Languages: English-Great Britain (EN-GB)

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Abstract

In the present work, commercial-grade activated carbon was modified by steam activation to improve its surface properties for high temperature desulfurization. The modified sample was also further upgraded by impregnating with KOH and KI to promote the chemisorption with of H2S. The H2S adsorption performance was tested under the temperature range of 30-550ฐC using the temperature program adsorption technique to understand the effect of adsorption temperature on the material adsorption characteristic. It was found that at ambient temperature, the impregnation of activated carbon with KOH can promote the H2S adsorption capacity of activated carbon, whereas the impregnation with KI does not provide a significant beneficial effect. At high adsorption temperature (upto 550ฐC), both KOH and KI impregnation considerably improve the H2S adsorption performance of activated carbon in terms of the adsorption capacity and breakthrough time. It was revealed from N2 adsorption, SEM and EDS measurement that the chemical reactions between H2S and alkaline compounds (KOH and KI) are promoted at high temperature. Based on all experimental results, the equilibrium adsorption model using the linear isotherm was developed to predict the adsorption behavior of these sorbents in terms of equilibrium isotherm constant and mass transfer coefficient for later scaling-up process. ฉ 2014 Copyright Taylor and Francis Group, LLC.

Keywords

hydrogen sulphide